/bb|[^b]{2}/ how does it work?

Assuming # for comments:

 /
  bb     # two b's
  |      #  or 
  [^     #  not
   b]{2} #  two b's
 /

Related Posts:

  1. OR condition in Regex
  2. Using or ‘|’ in regex [duplicate]
  3. What is a Context Free Grammar?
  4. What does \’.- mean in a Regular Expression
  5. How can I exclude one word with grep?
  6. How can I validate an email address using a regular expression?
  7. Regular expression to match a line that doesn’t contain a word
  8. Difference between \b and \B in regex
  9. Regex: ignore case sensitivity
  10. Python regex AttributeError: ‘NoneType’ object has no attribute ‘group’
  11. Regular Expression for alphanumeric and underscores
  12. What is the difference between the regular expressions [^\d\s] and [\D\S]
  13. Regular Expression for alphanumeric and underscores
  14. grep –ignore-case –only
  15. Regex AND operator
  16. python re.split() to split by spaces, commas, and periods, but not in cases like 1,000 or 1.50
  17. python re.split() to split by spaces, commas, and periods, but not in cases like 1,000 or 1.50
  18. Regex to test if string begins with http:// or https://
  19. Regular expression negative lookahead
  20. Regular Expression to match string starting with a specific word
  21. Regular Expressions: Is there an AND operator?
  22. Regular expression to match standard 10 digit phone number
  23. Regular Expression.how to add optional character at end of regex
  24. Regular Expression with wildcards to match any character
  25. What is a non-capturing group in regular expressions?
  26. How to validate an email address in PHP
  27. What is a non-capturing group in regular expressions?
  28. Regular expression to match standard 10 digit phone number
  29. How to use Regular Expressions (Regex) in Microsoft Excel both in-cell and loops
  30. Python string.replace regular expression
  31. How to use Regular Expressions (Regex) in Microsoft Excel both in-cell and loops
  32. Python string.replace regular expression
  33. Symbol for any number of any characters in regex?
  34. Grep and Python
  35. Regex – Does not contain certain Characters
  36. How to replace ” \ ” with ” \\ ” in java
  37. A regular expression to exclude a word/string
  38. Regex how to match an optional character
  39. How to validate an email address in JavaScript
  40. Using Bash regex match (=~) where regex includes quotes (” characters)
  41. Regular expression to match a word or its prefix
  42. How can I remove punctuation from input text in Java?
  43. Regular expression for exact match of a string
  44. Using the star sign in grep
  45. Regex optional group
  46. Regex for string contains?
  47. Regular Expression – Validate Gmail addresses
  48. Java; String replace (using regular expressions)?
  49. How can I remove punctuation from input text in Java?
  50. How can I output only captured groups with sed?
  51. How to negate specific word in regex?
  52. What is the grep equivalent in Python?
  53. javascript HTML from document.body.innerHTML
  54. Which regular expression operator means ‘Don’t’ match this character?
  55. Python re.split() vs split()
  56. How can I write a regex which matches non greedy?
  57. Negative matching using grep (match lines that do not contain foo)
  58. How to exclude a specific string constant?
  59. How to replace a whole line with sed?
  60. How to validate phone number using PHP?
  61. Validate phone number with JavaScript
  62. Can a URL contain a semicolon and still be valid?
  63. How is \\n and \\\n interpreted by the expanded regular expression?
  64. Regex to match only uppercase “words” with some exceptions
  65. Regular Expression to reformat a US phone number in Javascript
  66. Regex to match only letters
  67. Finding the complement of a DFA?
  68. RegEx to find two or more consecutive chars
  69. Regex to match an optional ‘+’ symbol followed by any number of digits
  70. Regex Match all characters between two strings
  71. Regular expressions in C: examples?
  72. How to ignore whitespace in a regular expression subject string?
  73. Regex: matching up to the first occurrence of a character
  74. Regex credit card number tests
  75. Regular expression – starting and ending with a character string
  76. Regular expression to stop at first match
  77. How do I match any character across multiple lines in a regular expression?
  78. Regular expression to remove HTML tags from a string
  79. Regex that matches integers in between whitespace or start/end of string only
  80. Regular Expressions- Match Anything
  81. What is the difference between square brackets and parentheses in a regex?
  82. My Vim replace with a regex is throwing a `E488: Trailing characters`
  83. Regular expression that matches valid IPv6 addresses
  84. Escaping Parentheses in Regex
  85. How to replace a string in an existing file in Perl
  86. Regex empty string or email
  87. Regex to validate date formats dd/mm/YYYY, dd-mm-YYYY, dd.mm.YYYY, dd mmm YYYY, dd-mmm-YYYY, dd/mmm/YYYY, dd.mmm.YYYY with Leap Year Support
  88. Regex difference: (\w+)? and (\w*)
  89. extract shortcodes from string
  90. preg_replace and comment_form_defaults
  91. 404 regular-expression advice needed
  92. How to use a variable as a className inside preg_match_all parameters?
  93. How to set up redirects for category paginated pages after adding /category/ to permalink
  94. Adding span tags to post titles using regex
  95. Remove Custom HTML Posts Using Regex
  96. Regexes allow only [a-z][A-Z][0-9] and –
  97. Call Shortcode Attribute Value within another function
  98. How to fix old embeded iframes with WP-CLI search-replace
  99. Regex For Extracting First 4 letters of search term
  100. Use Regex Redirection via htsaccess for RSS Feeds WordPress

Leave a Comment